Roud trip from/to Lenk passing through Simmfall, Sibe Brünne, Iffigfall.
http://www.myswitzerland.com/en/interests/hiking1/theme-hiking/hiking-along-the-water/springs-and-waterfalls-of-simme.html
It is good both clockwise (as reproted here) or counterclockwise (as suggested in the web site).
Suitable parking places are a the cable-car station just after the village center.